Fix issue with UI container update

Assets/Scripts/InteractableObjects/Items/ContainerItem.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using UnityEngine;
@@ -6,7 +7,7 @@ public class ContainerItem : MonoBehaviour
 {
     [SerializeField]
     private ContainerSO _containerSO;
-
+    public event EventHandler OnItemsChange;
 
     private List<BaseItemSO> _items = new List<BaseItemSO>();
 
@@ -21,12 +22,27 @@ public class ContainerItem : MonoBehaviour
         {
             Debug.Log($"Player put to container a {item.ItemName}");
             _items.Add(item);
+            OnItemsChange?.Invoke(this,EventArgs.Empty);
         }
         else
         {
             Debug.Log("Container is full");
         }
     }
+    
+    public void Remove(BaseItemSO item)
+    {
+        if (_items.Count>0)
+        {
+            Debug.Log($"Player remove {item.ItemName} from container");
+            _items.Remove(item);
+            OnItemsChange?.Invoke(this, EventArgs.Empty);
+        }
+        else
+        {
+            Debug.Log("Container is emplty");
+        }
+    }
 
     public List<BaseItemSO> GetItems()
     {

Assets/Scripts/Player/Player.cs

@@ -1,9 +1,11 @@
 using Assets.Scripts.Interfaces;
+using System;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Player : BaseCharacter
 {
+    public  event EventHandler<bool> OnContainerChanged;
     public static Player Instance { get; private set; }
     
     [SerializeField]
@@ -118,16 +120,21 @@ public class Player : BaseCharacter
         containerItem.transform.parent = _holdPoint;
         containerItem.transform.localPosition = Vector3.zero;
         _containerItem = containerItem;
+        OnContainerChanged.Invoke(this,true);
     }
+   
+    public void ClearContainerItem()
+    {
+        OnContainerChanged.Invoke(this, false);
+        Destroy(_containerItem.gameObject);
+        _containerItem = null;
+    }
+
     public ContainerItem GetContainerItem()
     {
         return _containerItem;
     }
-    public void ClearContainerItem()
-    {
-        Destroy(_containerItem.gameObject);
-        _containerItem = null;
-    }
+
     public bool IsHoldContainerItem()
     {
         return _containerItem != null;

Assets/Scripts/UIElements/ContainerItemsUI.cs

@@ -10,40 +10,47 @@ public class ContainerItemsUI : MonoBehaviour
     [SerializeField]
     private Transform _itemUITemplate;
 
+    private ContainerItem _playerContainer;
+
     private void Awake()
     {
         _container.gameObject.SetActive(false);
     }
 
-    private void Update()
+    private void Start()
     {
-        if (Player.Instance.IsHoldContainerItem())
+        Player.Instance.OnContainerChanged += OnContainerChanged;
+    }
+
+    private void OnContainerChanged(object sender, bool e)
+    {
+        if (e)
         {
-            var playerContainer = Player.Instance.GetContainerItem();
             _container.gameObject.SetActive(true);
-
-            if (playerContainer.IsSalebleItems())
-            {
-                ClearObject();
-
-                var playerItemsList = playerContainer.GetItems();
-                for (int count = 0; count < playerItemsList.Count; count++)
-                {
-                    var itemUI = Instantiate(_itemUITemplate, _itemsList);
-                    itemUI.gameObject.SetActive(true);
-                    itemUI.GetComponent<ItemDescriptionUI>().SetItem((SellableItemSO)playerItemsList[count]);
-                }
-            }
-            else
-            {
-                ClearObject();
-                _container.gameObject.SetActive(false);
-            }
+            _playerContainer = Player.Instance.GetContainerItem();
+            _playerContainer.OnItemsChange += OnItemsChange;
         }
         else
         {
-            ClearObject();
             _container.gameObject.SetActive(false);
+            _playerContainer.OnItemsChange -= OnItemsChange;
+            _playerContainer = null;
+        }
+    }
+
+    private void OnItemsChange(object sender, System.EventArgs e)
+    {
+        if (_playerContainer.IsSalebleItems())
+        {
+            ClearObject();
+
+            var playerItemsList = _playerContainer.GetItems();
+            for (int count = 0; count < playerItemsList.Count; count++)
+            {
+                var itemUI = Instantiate(_itemUITemplate, _itemsList);
+                itemUI.gameObject.SetActive(true);
+                itemUI.GetComponent<ItemDescriptionUI>().SetItem((SellableItemSO)playerItemsList[count]);
+            }
         }
     }